Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5dfc8e4f36e7b48cd031fdeed653d3734c1cc40ae6be14886411707560b83a9' 
  AND token = 'VZ+wlXGz03cvRrnczyf/WtjqPd/+drF6V6/mFy8/HCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}